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<div class="section" id="old-animation-example-code-animation-blit-fltk-py">
<span id="old-animation-animation-blit-fltk"></span><h1>old_animation example code: animation_blit_fltk.py<a class="headerlink" href="#old-animation-example-code-animation-blit-fltk-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>[<a class="reference external" href="animation_blit_fltk.py">source code</a>]</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">fltk</span>
<span class="kn">import</span> <span class="nn">matplotlib</span>
<span class="n">matplotlib</span><span class="o">.</span><span class="n">use</span><span class="p">(</span><span class="s">'FltkAgg'</span><span class="p">)</span>
<span class="kn">import</span> <span class="nn">pylab</span> <span class="kn">as</span> <span class="nn">p</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">npy</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="c"># save the clean slate background -- everything but the animated line</span>
<span class="c"># is drawn and saved in the pixel buffer background</span>
<span class="k">class</span> <span class="nc">animator</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">ax</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">=</span><span class="n">ax</span>
<span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">=</span><span class="n">ax</span><span class="o">.</span><span class="n">figure</span><span class="o">.</span><span class="n">canvas</span>
<span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">mpl_connect</span><span class="p">(</span><span class="s">'draw_event'</span><span class="p">,</span><span class="bp">self</span><span class="o">.</span><span class="n">clear</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="o">=</span><span class="mi">0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">background</span><span class="o">=</span><span class="bp">None</span>
<span class="c"># for profiling</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tstart</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">event</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">background</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">copy_from_bbox</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">ptr</span><span class="p">):</span>
<span class="c"># restore the clean slate background</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">background</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">background</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">copy_from_bbox</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">restore_region</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">background</span><span class="p">)</span>
<span class="c"># update the data</span>
<span class="n">line</span><span class="o">.</span><span class="n">set_ydata</span><span class="p">(</span><span class="n">npy</span><span class="o">.</span><span class="n">sin</span><span class="p">(</span><span class="n">x</span><span class="o">+</span><span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="o">/</span><span class="mf">10.0</span><span class="p">))</span>
<span class="c"># just draw the animated artist</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ax</span><span class="o">.</span><span class="n">draw_artist</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
<span class="c"># just redraw the axes rectangle</span>
<span class="bp">self</span><span class="o">.</span><span class="n">canvas</span><span class="o">.</span><span class="n">blit</span><span class="p">(</span><span class="n">ax</span><span class="o">.</span><span class="n">bbox</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="o">+=</span><span class="mi">1</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">cnt</span><span class="o">==</span><span class="mi">1000</span><span class="p">:</span>
<span class="c"># print the timing info and quit</span>
<span class="k">print</span> <span class="s">'FPS:'</span> <span class="p">,</span> <span class="mi">1000</span><span class="o">/</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span><span class="o">-</span><span class="bp">self</span><span class="o">.</span><span class="n">tstart</span><span class="p">)</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">()</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="n">ax</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">subplot</span><span class="p">(</span><span class="mi">111</span><span class="p">)</span>
<span class="n">p</span><span class="o">.</span><span class="n">subplots_adjust</span><span class="p">(</span><span class="n">left</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">bottom</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span> <span class="c"># check for flipy bugs</span>
<span class="n">p</span><span class="o">.</span><span class="n">grid</span><span class="p">()</span> <span class="c"># to ensure proper background restore</span>
<span class="c"># create the initial line</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">npy</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="o">*</span><span class="n">npy</span><span class="o">.</span><span class="n">pi</span><span class="p">,</span><span class="mf">0.01</span><span class="p">)</span>
<span class="n">line</span><span class="p">,</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">npy</span><span class="o">.</span><span class="n">sin</span><span class="p">(</span><span class="n">x</span><span class="p">),</span> <span class="n">animated</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="n">p</span><span class="o">.</span><span class="n">draw</span><span class="p">()</span>
<span class="n">anim</span><span class="o">=</span><span class="n">animator</span><span class="p">(</span><span class="n">ax</span><span class="p">)</span>
<span class="n">fltk</span><span class="o">.</span><span class="n">Fl</span><span class="o">.</span><span class="n">add_idle</span><span class="p">(</span><span class="n">anim</span><span class="o">.</span><span class="n">update</span><span class="p">)</span>
<span class="n">fltk</span><span class="o">.</span><span class="n">Fl</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
</pre></div>
</div>
<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p>
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